After downloading Safari 6, I noticed that there are a couple issues with it for me. After quitting the browser and reopening it, the previous windows always open, even if the computer has restarted. I would prefer the homepage to open, and I remember in Safari 5 there was a preference to change that, but I don't see one here.
Also, the thumbnails on all my bookmarks and saved pages keep disappearing for some reason. This might be after I clear the history, which I have set to daily, but not sure why that would be.

I've noticed a couple stranger issues such as once or twice the homepage being reset to apple.com and once the folder for downloaded files being switched back after changing it. These were probably flukes, but I really hope there is a solution to the above two problems. I kind of like the single search bar, but overall I wish I hadn't upgraded.

Basically the icons next to each link in my bookmarks that are normally that page's icon keep resetting to the blank blue globe. This happens when the history is cleared, which I have at daily (so every day they're reset until I visit them again.) This used to never happen except maybe when I cleared the cache and everything with Onyx.